PLease Help - Need Canvas 9.0.4 alternative

My uncle is elderly & has been using Deneba Canvas for Years (Since v 3) and is very familiar with it. A recent MAC OS upgrade has rendered this program (v 9.0.4) NON-functional on his system. He is desperately looking for an alternative - which is the most similar. He is over 80 YO and the smoothest transition will be the best solution.

Can any one help with any recommendations of similar (look and functions) MAC programs to the now ACD canvas (windows only). He will not change OS to windoze.